Performance Analysis of Sliding Mode Controlled Bridgeless Interleaved Boost Converter for Battery Charging Applications

In the recent years, the necessity of Power Factor Correction (PFC) circuit is essential in battery charging systems, switched mode power supplies and LED (Light Emitting Diode) lighting systems. The harmonics introduced due to non-sinusoidal current drawn by the diode rectifiers can be avoided if the circuit includes active PFC circuits. In this paper, Sliding Mode Controller (SMC) design using the small signal model of Bridgeless Interleaved Boost Converter (BLIBC) for power factor correction is proposed. The control objective is threefold: (i) DC output voltage regulation under load and supply side disturbances (ii) Minimization of THD in source current ensuring improved supply side power factor (iii) Tracking of output voltage for desired reference voltage setting. The mitigation of harmonics along with regulated DC bus voltage is achieved by designing a SMC to operate at a constant switching frequency and the control law is derived following a systematic approach. The schematics are executed using MATLAB/SIMULINK (R) and the modeling is validated through the simulation results. The performance parameters are obtained for varying load and supply voltage conditions.